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DB2 for IBM I Database Modernization: Object Creation and Access Agenda Key:23MA Session Number:470182 DB2 for IBM i Database Modernization: Object Creation and Access Tom Mckinley ([email protected]) Lab Services IBM Rochester 8 Copyright IBM Corporation, 2009. All Rights Reserved. This publication may refer to products that are not currently available in your country. IBM makes no commitment to make available any products referred to herein. Agenda • Why modernize with SQL & DB2? • Approaches & Options • Modernizing Database Definitions • Modernizing Data Access • Next Steps © 2009 IBM Corporation Why SQL? • Portability of code & skills • Strategic database interface for industry & i5/OS – Faster performance delivered by SQE only available to SQL-based interfaces – SQL required for certain functions & middleware • J2EE architecture based on SQL interfaces • Data types: BLOB, CLOB, Datalink, ... • Auto-Incrementing Constructs: Sequence & Identity column attribute • Column-level Triggers • Encryption & Decryption functions • Encoded Vector Indices • ... • Enables better positioning of System i as a Database Server • SQL as a programming language can reduce total lines of code • DB2 SMP - parallel database processing © 2009 IBM Corporation Approaches & Options ODBC / JDBC / ADO / DRDA / XDA Network Host Server CLI / JDBC Static Dynamic Extended Dynamic Compiled Prepare Prepare embedded every once and statements time then reference Native SQL (Record I/O) Optimizer DB2 (Data Storage & Management) © 2009 IBM Corporation Approaches & Options SQL Considerations: SQL-created Programs Multi-member & objects multi-format files DDS-created Native* objects Programs *Restrictions: EVIs, LOB columns, UDTs, Datalinks, etc © 2009 IBM Corporation Modernizing Definitions & Objects • Modeling • Terminology • Moving from DDS to SQL DDL • SQL object management • Embedding business logic into database definitions © 2009 IBM Corporation Modernizing Definitions & Objects Data modeling • “Master data” concept –Services created to retrieve data – what if multiple copies exist? • Database normalization –Define a separate table for each related set of values –Define the primary key (surrogate or natural) –Eliminate redundant data –Fifth normal form (5NF) recommended, 3NF at minimum –Establish RI constraints • Also consider –Globalization Normalization © 2009 IBM Corporation Modernizing Definitions & Objects Data Modeling IBM Rational Data Architect (Version 7) • Enterprise data modeling and management – Compare & synchronize – Forward & reverse engineering – Logical file support – Fixpack 003 – Model analyzer for enterprise standard conformance • Database development – SQL Stored Procedures and Function • Trial Download: ibm.com/software/data/integration/rda/ © 2009 IBM Corporation Modernizing Database Objects Terminology SQL i5/OS schema/collection library table physical file view logical file index keyed logical file row record column field log journal © 2009 IBM Corporation Modernizing Database Definitions & Objects Tables vs PFs • SQL Tables compared with Physical Files – Advantages • More data types • Constraint definitions can be included in object source • Faster reads • Longer, more descriptive column names • Data Modeling Tool support • DB2 attempts to automatically journal tables – Disadvantages • Slower writes • No DDM, BUT SQL can utilize DRDA connections • Multi-member files – SQL ALIAS provides solution: CREATE ALIAS JanSales FOR SALES (JANUARY ) © 2009 IBM Corporation Modernizing Database Definitions & Objects Indexes vs LFs • SQL Indexes compared with Keyed Logical Files – Advantages • Encoded Vector Index Structure • 64K Logical Page Size (since V4R2) – more aggressive input – Disadvantages • 8K Logical Page Size – less aggressive input • No support for Select/Omit filtering or join logical files – V6R1 provides new syntax to allow the creation of SQL indexes with selection criteria and derivations © 2009 IBM Corporation V6R1 – SQL Derived Index Example DDS for Existing Select/Omit LF: A R ITEM_FACT PFILE(ITEM_FACT) A ORDERKEY A SHIPMODE A PARTKEY A K ORDERKEY A K SHIPMODE • Equivalent SQL syntax: CREATE A INDEX S sql_selectomitSHIPMODE COMP(EQ 'MAIL') ON item_fact ( orderkey, shipmode ) WHERE shipmode = 'MAIL' RCDFMT item_fact ADD partkey © 2009 IBM Corporation Modernizing Database Definitions & Objects Views vs LFs • SQL Views compared with Logical Files – Advantages • More flexibility in terms of selecting & processing data – CASE expressions & Date/Time functions – Grouping & more advanced Join processing • Can be used as logical files to enhance native functionality – Disadvantages • Views cannot be keyed/ordered – Does that mean SQL Views have slower performance? • NO - assuming you have the right set of indexes/statistics in place for the query optimizer to use • View is used by SQL just to transform data, query optimizer's job to find the best method to speed up selection or sorting • Fastest method may not be a keyed access method © 2009 IBM Corporation Modernizing Database Definitions & Objects DDS to SQL Conversion • System i Navigator Generate SQL Task (QSQGNDDL API) – Useful in converting object definitions from DDS to SQL – Supports physical & logical files • Not all DDS features can be converted, tool will convert as much as possible and generate warnings for unconvertible options (e.g., EDTCDE) • Logical files converted to SQL Views • SQL Field Reference File support not used – Can convert a single object or a group of objects – Output can be edited & saved directly into source file members © 2009 IBM Corporation Modernizing Database Definitions & Objects SQL Object Compatibility • SQL Column & Object names have maximum lengths of 30 & 128, but many i5/OS utilities, commands and interfaces only support a 10-character length. How does that work?!?! – System automatically generates a short 10 character name • First 5 chars with unique 5 digit number CUSTOMER_MASTER >> CUSTO00001 • Might be different each time a specific table is created, depending on creation order and what other objects share the same 5 character prefix • Use i5/OS SQL syntax to specify your own short name – RENAME TABLE (tables & views) & RENAME INDEX – FOR COLUMN clause for columns – SPECIFIC clause for procedures, functions © 2009 IBM Corporation Modernizing Database Definitions & Objects SQL Object Compatibility • Short & Long Name Co-existence Example – Specify the short name at creation: CREATE TABLE dbtest/cusmst (customer_name FOR COLUMN cusnam CHAR(20), customer_city FOR COLUMN cuscty CHAR(40)) – Specify a long name for existing short-name: RENAME TABLE dbtest/cusmst TO customer_master FOR SYSTEM NAME cusmst • If long name specified on SQL Table definition, can also add/control the short name after table created: RENAME TABLE dbtest/customer_master TO SYSTEM NAME cusmst © 2009 IBM Corporation Modernizing Database Definitions & Objects SQL Object Compatibility • RENAME statement can also be used to control the format & file name used by native programs ► Specify the format name (cmfmt) when creating the table CREATE TABLE dbtest/cmfmt (customer_name FOR COLUMN cusnam CHAR(20), customer_city FOR COLUMN cuscty CHAR(40)) ► Use RENAME to specify the short file name (cusmst) for table: RENAME TABLE dbtest/cmfmt TO cusmst ► Use RENAME to specify the long name for SQL interfaces RENAME TABLE dbtest/cusmst TO customer_master FOR SYSTEM NAME cusmst ► V5R4 simplifies control of the record format name with new SQL keyword… CREATE TABLE dbtest/customer_master (customer_name FOR COLUMN cusnam CHAR(20), customer_city FOR COLUMN cuscty CHAR(40)) RCDFMT cmfmt © 2009 IBM Corporation Modernizing Database Definitions & Objects SQL Object Compatibility • What happens to my existing applications if my objects are now created with SQL instead of DDS? IT DEPENDS on your approach! © 2009 IBM Corporation Modernizing Database Definitions & Objects SQL Object Compatibility • Recommend Methodology (documented in IBM Redbook) – Convert Physical file source (PF1) into SQL Table (TAB1) – Delete physical file PF1 – Convert the PF1 DDS source into a Logical file named PF1 that references TAB1 – Change the source for all logical files over PF1 to share format of PF1 and reference TAB1 R PF1 FILER PFILE(TAB1) FORMAT(PF1) • XCase for System i new tool available to automate & manage this conversion methodology – Ensure the right steps are done in proper order – Data modeling tool also available © 2009 IBM Corporation Modernizing Database Definitions & Objects SQL Object Management • SQL Source Management best practices: – Store SQL source in source physical file members just like DDS and “execute” with the RUNSQLSTM instead of CRTPF/CRTLF • Store SQL scripts in PC or IFS files for non-i5/OS change management tools • Generate SQL can be used to retrieve misplaced SQL source from System Catalogs (SYSIBM & QSYS2) • V6R1 RUNSQLSTM supports IFS files and wider margins & CL commands – SQL Table definitions can use Field Reference File CREATE TABLE customer AS (SELECT id cust_id, lname cust_lastname, fname cust_firstname, city cust_city FROM RefFile) WITH NO DATA • May need to adjust process for moving from development to production – Best practice is to re-execute SQL creation script – Save/Restore process for SQL databases documented at: ibm.com/developerworks/db2/library/techarticle/0305milligan/0305milligan.html © 2009 IBM Corporation Modernizing Definitions & Objects SQL & Non-relational data • User-Defined Table Functions – Allows non-relational & legacy data to be virtualized as an SQL table SELECT * FROM TABLE(myudtf('Part XYZ')) – Both
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